Printing machine



FIG. 1 is a left side perspective view of a printing machine showing my new design;

FIG. 2 is a right side perspective view;

FIG. 3 is a front elevational view;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view;

FIG. 6 is a rear elevational view; and,

FIG. 7 is a top plan view. 

The ornamental design for a printing machine, as shown. 